Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare write/safe (readOnlyHint=false, destructiveHint=false, openWorldHint=false), so the bar is lower, and the description still adds real value: 'It does not move money' clarifies the semantic effect of the write, and 'Returns the saved record with its SyncToken' discloses the return shape despite there being no output schema. It does not cover permissions, idempotency, or duplicate handling.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Four short sentences, front-loaded with the action, then scope, then behavioral caveat, then return value. Every sentence carries distinct information with no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with a rich nested schema and no output schema, the description covers what it creates, its semantic effect, and its return value. Remaining gaps (required permissions, what happens on conflicting/duplicate records) are minor given the strong schema coverage and annotations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the nested entity object and company parameter are already fully documented in the schema, including the required TxnDate/Amount/BankAccountRef/CreditCardAccountRef fields. The description adds no parameter-level meaning beyond that, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource ('Create a credit card payment txn in QuickBooks Online') and adds a semantic gloss — 'an accounting record of a bank payment toward a credit card balance' — that separates it from generic payment/transfer siblings. It stops short of naming the alternative tools (create_payment, create_transfer), so it is clear but not fully differentiated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

'It does not move money' implicitly tells the agent when this is appropriate (recording a payment vs. actually transferring funds), which is genuinely useful routing context. However there is no explicit when-to-use/when-not statement and no named alternatives, so guidance remains implied rather than stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.